[docs] [issue10965] dev task of documenting undocumented APIs

[Carol Willing]

Carol Willing added the comment:

Add key points from linked email in msg126662 to documentation section of the devguide. 

* provide developers guidance on how to document undocumented APIs
* when and how to use __all__
* include rules from the linked email
* highlight "do no harm" to existing users as discussed in email

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assignee:  -> docs at python
components: +Devguide
nosy: +docs at python, ezio.melotti, willingc

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<http://bugs.python.org/issue10965>
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